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Session 24

Efficient Processing of Multiple Contacts in MPP-DYNA
Complex models often contain more than just a few contact interfaces. The decomposition of such a model can result in an uneven distribution of these contacts among the available processors. Some contacts may lie wholly on a single processor, while others will be distributed across many or all of the processors. Some processors may have many contacts to handle, and others may have none. This variability can cause inefficiencies which adversely impact scalability. I will show recent work on contact algorithms in MPP-DYNA which addresses some of these issues.
The Effect of MPI Collective Operations and MPI Collective Offloads on LS-DYNA Performance
From concept to engineering, and from design to test and manufacturing, the automotive industry relies on powerful virtual development solutions. CFD and crash simulations are performed in an effort to secure quality and accelerate the development process. The recent trends in cluster environments, such as multi-core CPUs, GPUs, cluster file systems and new interconnect speeds and offloading capabilities are changing the dynamics of clustered- based simulations. Software applications are being reshaped for higher parallelism and hardware configuration for solving the new emerging bottlenecks, in order to maintain high scalability and efficiency. In this paper we cover new hardware based accelerations and offloads for MPI collectives communications and how is affect LS-DYNA performance and productivity.
ODB-10M New Topcrunch Benchmark Data
New Benchmark model ODB-10M is 10 million elements model, which consist of refined NCAC Taurus model and LSTC shell ODB barrier model. Refined NCAC Taurus model is 9 million elements of type16 shell elements and type2 solid elements, and *CONSTRAINED_SPOTWELD is changed to *CONTACT_SPOTWELD with beam. In LSTC shell barrier, type10 shell element is changed to type16 shell element in order to avoid negative hourglass energy. We also discuss about the domain decomposition.